Генератор последовательностей

gistfile1.py

import datetime
import random
import string

def seq_gen(length=5, uppercase=True, lowercase=True, digits=True,
            special=True, extra=None):
    """
    Returns the sequence of given length consists of specified
    group of chars: digits, uppercase, lowercase, punctuation or
    custom set.
    """
    randomizers = []
    c, s = random.choice, string

    if uppercase:
        randomizers.append(lambda: c(s.uppercase))
    if lowercase:
        randomizers.append(lambda: c(s.lowercase))
    if digits:
        randomizers.append(lambda: c(s.digits))
    if special:
        randomizers.append(lambda: c(s.punctuation))
    if extra:
        randomizers.append(lambda: c(extra))
    if not randomizers:
        raise TypeError, "Specify at least one char range"
    return u''.join([c(randomizers)() for _ in xrange(length)])